"Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds."?The unofficial motto of the U.S. Postal Service, taken from Herodotus and carved above the New York City Post Office on 8th Ave., speaks to the dedication and perseverance of the nation's postal workers. The Post Office has been an important part of American daily life and business since the Revolution, and today services over 156 million addresses. Read on to find current postage rates, state abbreviations, postal codes, postal workers bitten by dogs, women who left their "stamps" on history, and more.